Travertineis limestone that has been formed over a long period of time. The product is porous with many visible holes. It is available in coilers ranging from ivory to golden brown. The holes and cavities may be filled.
It is a sedimentary calciferous stone formed in hot springs. Typically, hot water passes through limestone beds and takes the calcium, from the limestone into suspension and takes that solution to the surface where the water evaporates and leaves the calcium crystals in layers on the surface.

Silver Travertine can be found in Kashan, Azarshahr and Takab city of Iran.